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structure ToyCache : sig
val cache : Cache.cache
end = struct
(* Mono *)
open Mono
val dummyLoc = ErrorMsg.dummySpan
val stringTyp = (TFfi ("Basis", "string"), dummyLoc)
val optionStringTyp = (TOption stringTyp, dummyLoc)
fun withTyp typ = map (fn exp => (exp, typ))
fun ffiAppCache' (func, index, argTyps) =
EFfiApp ("Sqlcache", func ^ Int.toString index, argTyps)
fun check (index, keys) =
ffiAppCache' ("check", index, withTyp stringTyp keys)
fun store (index, keys, value) =
ffiAppCache' ("store", index, (value, stringTyp) :: withTyp stringTyp keys)
fun flush (index, keys) =
ffiAppCache' ("flush", index, withTyp optionStringTyp keys)
fun lock (index, keys) =
raise Fail "ToyCache doesn't yet implement lock"
(* Cjr *)
open Print
open Print.PD
fun setupQuery {index, params} =
let
val i = Int.toString index
fun paramRepeat itemi sep =
let
fun f n =
if n < 0 then ""
else if n = 0 then itemi (Int.toString 0)
else f (n-1) ^ sep ^ itemi (Int.toString n)
in
f (params - 1)
end
fun paramRepeatInit itemi sep =
if params = 0 then "" else sep ^ paramRepeat itemi sep
val args = paramRepeatInit (fn p => "uw_Basis_string p" ^ p) ", "
val decls = paramRepeat (fn p => "uw_Basis_string param" ^ i ^ "_"
^ p ^ " = NULL;")
"\n"
val sets = paramRepeat (fn p => "param" ^ i ^ "_" ^ p
^ " = strdup(p" ^ p ^ ");")
"\n"
val frees = paramRepeat (fn p => "free(param" ^ i ^ "_" ^ p ^ ");")
"\n"
val eqs = paramRepeatInit (fn p => "strcmp(param" ^ i ^ "_" ^ p
^ ", p" ^ p ^ ")")
" || "
(* Using [!=] instead of [==] to mimic [strcmp]. *)
val eqsNull = paramRepeatInit (fn p => "(p" ^ p ^ " == NULL || "
^ "!strcmp(param" ^ i ^ "_"
^ p ^ ", p" ^ p ^ "))")
" && "
in
Print.box
[string "static char *cacheQuery",
string i,
string " = NULL;",
newline,
string "static char *cacheWrite",
string i,
string " = NULL;",
newline,
string decls,
newline,
string "static uw_Basis_string uw_Sqlcache_check",
string i,
string "(uw_context ctx",
string args,
string ") {",
newline,
string "if (cacheWrite",
string i,
(* ASK: is returning the pointer okay? Should we duplicate? *)
string " == NULL",
string eqs,
string ") {",
newline,
string "puts(\"SQLCACHE: miss ",
string i,
string ".\");",
newline,
string "uw_recordingStart(ctx);",
newline,
string "return NULL;",
newline,
string "} else {",
newline,
string "puts(\"SQLCACHE: hit ",
string i,
string ".\");",
newline,
string " if (cacheWrite",
string i,
string " != NULL) { uw_write(ctx, cacheWrite",
string i,
string "); }",
newline,
string "return cacheQuery",
string i,
string ";",
newline,
string "} };",
newline,
string "static uw_unit uw_Sqlcache_store",
string i,
string "(uw_context ctx, uw_Basis_string s",
string args,
string ") {",
newline,
string "free(cacheQuery",
string i,
string "); free(cacheWrite",
string i,
string ");",
newline,
string frees,
newline,
string "cacheQuery",
string i,
string " = strdup(s); cacheWrite",
string i,
string " = uw_recordingRead(ctx);",
newline,
string sets,
newline,
string "puts(\"SQLCACHE: store ",
string i,
string ".\");",
newline,
string "return uw_unit_v;",
newline,
string "};",
newline,
string "static uw_unit uw_Sqlcache_flush",
string i,
string "(uw_context ctx",
string args,
string ") {",
newline,
string "if (cacheQuery",
string i,
string " != NULL",
string eqsNull,
string ") {",
newline,
string "free(cacheQuery",
string i,
string ");",
newline,
string "cacheQuery",
string i,
string " = NULL;",
newline,
string "free(cacheWrite",
string i,
string ");",
newline,
string "cacheWrite",
string i,
string " = NULL;",
newline,
string "puts(\"SQLCACHE: flush ",
string i,
string ".\");}",
newline,
string "else { puts(\"SQLCACHE: keep ",
string i,
string ".\"); } return uw_unit_v;",
newline,
string "};",
newline,
newline]
end
val setupGlobal = string "/* No global setup for toy cache. */"
(* Bundled up. *)
val cache = {check = check, store = store, flush = flush, lock = lock,
setupQuery = setupQuery, setupGlobal = setupGlobal}
end
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